The cilia are arranged on short transverse plates and beat in synchrony to propel the animal through the water, giving a shimmering effect.

[2] Beroe cucumis is a predator and mostly feeds on other comb jellies, particularly Bolinopsis infundibulum; these are pulled into the large mouth and swallowed whole.

[3] The comb jelly Mnemiopsis leidyi is an invasive species originally native to the western Atlantic coastal waters that was introduced into the Black Sea in the 1980s, with deleterious results to the ecosystem.

In the Black Sea, some measure of control was achieved when another predatory comb jelly, Beroe ovata, was introduced.

Beroe cucumis is native to the northern Atlantic Ocean and sometimes occurs in the Mediterranean Sea, and it is being monitored to see if it can provide some level of control of M. leidyi.